Difference between revisions of "HRS Checkout (Experts)"
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(New page: The detector checkout is best done using a fairly uniform illumination, which is provided for by 20 μA on the central Carbon target at the following kinematics: E' = 3.056 GeV, &theta...) |
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provided for by 20 μA on the central Carbon target at the following kinematics: | provided for by 20 μA on the central Carbon target at the following kinematics: | ||
| − | E' = | + | E' = 2.918 GeV, θ = 22.8 degrees (W<sup>2</sup> = 2.40 GeV, Q<sup>2</sup> = 3.33 GeV<sup>2</sup>). The |
| − | HRS electron rates should be about | + | HRS electron rates should be about 230 Hz. |
<table border="1" style="width:80%"> | <table border="1" style="width:80%"> | ||
<tr> | <tr> | ||
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<tr> | <tr> | ||
<td>7.3</td> | <td>7.3</td> | ||
| − | <td> | + | <td>2.918</td> |
| − | <td> | + | <td>22.8</td> |
<td>None</td> | <td>None</td> | ||
<td>Single Carbon</td> | <td>Single Carbon</td> | ||
Revision as of 15:48, 26 October 2014
The detector checkout is best done using a fairly uniform illumination, which is provided for by 20 μA on the central Carbon target at the following kinematics:
E' = 2.918 GeV, θ = 22.8 degrees (W2 = 2.40 GeV, Q2 = 3.33 GeV2). The HRS electron rates should be about 230 Hz.
| Ebeam [GeV] | P0 [GeV/c] | θe [deg] | Collimator | Target | Fast Raster X x Y |
Beam Current | Trigger |
| 7.3 | 2.918 | 22.8 | None | Single Carbon | off | 20 μA | S0&&S2m |
- With the above kinematics, take a run (at least 100K events or 10 minutes) and verify that all detector channels are working.
- Using the same run, produce a ROOT tree, and do the following: make a spectrum of x vs. y at the focal plane. What you should see is a "spider" with 5 legs. The non-straightness of the central legs indicates there is an offset in the Z or Y direction. If you don't see a "spider" or something resembling it, then of of the polarities of the HRS magnets is set wrong (or a magnet is off).
- Check that the signals are well timed.
- Determine correct thresholds.
- Verify all scalers are incrementing.
- Check for double pulsing and time the wire chamber signals.
- Are the scintillator signals for on scale in the scintillator ADCs?
- PID threshold checks.
